powerpc/pseries: Add backward compatibilty to read old kernel oops-log
Older kernels has just length information in their header. Handle it while reading old kernel oops log from pstore. Applies on top of powerpc/pseries: Fix buffer overflow when reading from pstore Signed-off-by: Aruna Balakrishnaiah <aruna@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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